Douglass: \'ki<i i:i!R.\ iks from Montana 'rKRiiAKv. 151 



The following list of fossils from this horizon is taken from Scott's 

 Mammalia of the Deep River Beds, p. 58. 

 Cy/h>i/fs//i//s (hodiih's Scott. 

 Sfeneofiher montanus Scott. 



Cicnopiis. f 



Aliohippus annectens ? Marsh. 

 M. anceps ? Marsh. 

 M. (^Anchiterium) equiceps ? Co\)G. 

 Mesoreodon chela nyx Scott. 

 M. intermedins Scott. 

 Pa'brotherium sp. 

 Hype rtra^::;u Ins calcaratiis Cope. 



Beds Doubtfully Oligocene. 



Besides the beds which I have called Fort Logan and which Scott 

 suspects are John Day, the writer has, in previous years, found locali- 

 ties where the few fossils that were found and also the lithological 

 character of the beds seem to indicate a formation intermediate be- 

 tween the White River and Loup Fork. One locality in which the 

 best material was found is about three miles east of the town of Drum- 

 mond on the Hellgate River. Only three good specimens were 

 obtained here and none of these can I identify with species found else- 

 where. 



The strata are light colored, resembling the White River in some 

 respects, yet more like part of the Loup Fork in not being distinctly 

 stratified. 



List of Fossils. 



Mesocyon ? drumiiiondensis Douglass. 

 Leptomeryx transuiontaniis Douglass. 

 Promerycochxnts i/ii/ior Douglass. 



MIOCENE. 

 The Loup Fork Formation. 

 In the valleys of western Montana there are at least three phases of 

 the Loup Fork — that is, there are beds with three different assem- 

 blages of fossils. How much of this is due to actual difference of 

 time and how much to different conditions of preservation is difficult 

 to determine. The valuable suggestions, which Dr. W. D. Matthew ' 



' "Fossil Mammals from Colorado,"' and " Is the White River an Aeolian De- 

 dosit ? ' ' 



